Error code reference

Samsung Air Conditioner Error Code E221

Outdoor unit temperature sensor error (Open/Short) - error level over 4.9V (-50C) or below 0.4V (93C).

SourceSamsung Air Conditioner - Service Manual: PCB Setup & Troubleshooting (ND022LHXEA)p. 4-25, 4-65

Samsung codes Samsung air conditioner codes

Diagnostic procedure

The full E221 procedure

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MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Check if outdoor temperature sensor connector is dislocated from PCB; measure resistance between both terminals.

SourceSamsung Air Conditioner - Service Manual: PCB Setup & Troubleshooting (ND022LHXEA)p. 4-25, 4-65

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

16 manuals in the MyPros+ library document this code for Samsung air conditioner.

Models covered by the manuals that document this code

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The full E221 procedure

Where this code is documented

Models covered by the manuals that document this code

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